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Hello graytape, was the fuel gauge and low fuel light working and then one day just stopped working?, if so, you have probably blown a fuse and you should be able to locate what fuse and where it's located in the owner's manual.
If you recently got the vehicle and then you found out that the gas gauge and low fuel light doesn't work then that is something completely different.
without knowing the year of the vehicle I can only give you an educated guess.
Many vehicles have a float in the gas tank and this float is directly linked to what you see on the gas gauge. However, after a number of years the floats get saturated from the fuel and become heavy, heavy enough to where they don't float anymore. That is one of the most common causes of the fuel gauge not working.
The sensor that activates the low fuel warning light may be independent of the fuel gauge and the fuel in the tank isn't low enough to turn it on. Your tank has to be very low to activate the low fuel warning light.
Good luck!

there are 2 large terminal plugs with the wiring for all the instruments that are plugged into the back of that panel. make sure they are snug and in place. You reach in and under but it may easier to "simply" remove the cluster. 4 screws hold it in place accessible form underneath and with a long phillips screwdriver and lighting.

hello! there, fuel gauge not accurately reading or registering your actual fuel,this can spend costly so much on refueling of gas due to worries on drying of tank.there are factor to check on fuel sensor this maybe malfunction,or check the fuel lever sensor this was located on your fuel tank,This should be done on car service center
not by yourself this is due to hard work besides fuel is flammable in small spark of igniton by a certain object.be sure to take all necessasry precaution on doing this.so its beteer qualified mechanic to this.thanks and regads..